Hyphally regulated cell wall protein 1 (Hyr1) (Hyr1)

Candida albicans Hyphally regulated cell wall protein 1 (Hyr1) is a glycosylphosphatidylinositol (GPI)-anchored surface protein expressed specifically during the hyphal (filamentous) growth phase of the fungus. It serves as a critical virulence factor by mediating resistance to host innate immunity, specifically protecting the fungus from neutrophil-mediated phagocytosis and killing. Hyr1 has also been identified as a cross-kingdom receptor that interacts with outer membrane proteins of Gram-negative bacteria like Acinetobacter baumannii, facilitating the formation of mixed-species biofilms and enhancing bacterial virulence. Due to its surface exposure and essential role in pathogen survival and immune evasion, Hyr1 is a primary candidate for antifungal vaccines and monoclonal antibody therapies. Experimental vaccines utilizing the recombinant N-terminal domain (rHyr1p-N) have demonstrated protective efficacy in animal models against disseminated candidiasis and lethal bacterial infections. Therapeutic strategies targeting Hyr1 focus on neutralizing its protective function, thereby sensitizing the pathogen to host immune responses and disrupting the structural integrity of biofilms in clinical settings.

Other names

Hyr1pHyphally-regulated proteinAdhesin-like protein HYR1GPX1CaO19.12440CaO19.4975CAALFM_C113450WA

Neutralization of fungal immune evasion factors to enhance opsonophagocytic killing by neutrophils and inhibition of microbial adhesion to host tissues or other pathogens to prevent biofilm formation.